<template>
	<!-- 面包屑 -->
	<el-breadcrumb class="app-breadcrumb" separator="/">
		<transition-group name="breadcrumb">
			<el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
				<span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{
					item.meta?.title }}</span>
				<a v-else @click.prevent="handleLink(item)">{{ item.meta?.title }}</a>
			</el-breadcrumb-item>
		</transition-group>
	</el-breadcrumb>
</template>

<script setup>
import { usePermissionStore } from '@/store/modules/permission';

const route = useRoute();
const router = useRouter();
const permissionStore = usePermissionStore();
const levelList = ref([]);

const getBreadcrumb = () => {
	// only show routes with meta.title
	let matched = [];
	const pathNum = findPathNum(route.path);
	// multi-level menu
	if (pathNum > 2) {
		const reg = /\/\w+/gi;
		const pathList = route.path.match(reg).map((item, index) => {
			if (index !== 0) item = item.slice(1);
			return item;
		});
		getMatched(pathList, permissionStore.defaultRoutes, matched);
	} else {
		matched = route.matched.filter((item) => item.meta && item.meta.title);
	}
	// 判断是否为首页
	if (!isDashboard(matched[0])) {
		matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched);
	}
	levelList.value = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false);
};
const findPathNum = (str, char = '/') => {
	if (typeof str !== 'string' || str.length === 0) return 0;
	return str.split(char).length - 1;
};
const getMatched = (pathList, routeList, matched) => {
	const data = routeList.find((item) => item.path == pathList[0] || (item.name += '').toLowerCase() == pathList[0]);
	if (data) {
		matched.push(data);
		if (data.children && pathList.length) {
			pathList.shift();
			getMatched(pathList, data.children, matched);
		}
	}
};
const isDashboard = (route) => {
	const name = route && (route.name);
	if (!name) {
		return false;
	}
	return name.trim() === 'Index';
};
const handleLink = (item) => {
	const { redirect, path } = item;
	redirect ? router.push(redirect) : router.push(path);
};

watchEffect(() => {
	// if you go to the redirect page, do not update the breadcrumbs
	if (route.path.startsWith('/redirect/')) return;
	getBreadcrumb();
});
onMounted(() => {
	getBreadcrumb();
});
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
	display: inline-block;
	font-size: 14px;
	line-height: 50px;
	margin-left: 8px;

	.no-redirect {
		color: #97a8be;
		cursor: text;
	}
}
</style>
